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39
40#include "qplatformprintplugin.h"
41#include "qplatformprintersupport.h"
42#include "qprinterinfo.h"
43#include "private/qfactoryloader_p.h"
44#include <qcoreapplication.h>
45#include <qdebug.h>
46
47#ifndef QT_NO_PRINTER
48
49QT_BEGIN_NAMESPACE
50
51Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, loader,
52 (QPlatformPrinterSupportFactoryInterface_iid, QLatin1String("/printsupport"), Qt::CaseInsensitive))
53
54QPlatformPrinterSupportPlugin::QPlatformPrinterSupportPlugin(QObject *parent)
55 : QObject(parent)
56{
57}
58
59QPlatformPrinterSupportPlugin::~QPlatformPrinterSupportPlugin()
60{
61}
62
63static QPlatformPrinterSupport *printerSupport = nullptr;
64
65static void cleanupPrinterSupport()
66{
67 delete printerSupport;
68 printerSupport = nullptr;
69}
70
71/*!
72 \internal
73
74 Returns a lazily-initialized singleton. Ownership is granted to the
75 QPlatformPrinterSupportPlugin, which is never unloaded or destroyed until
76 application exit, i.e. you can expect this pointer to always be valid and
77 multiple calls to this function will always return the same pointer.
78*/
79QPlatformPrinterSupport *QPlatformPrinterSupportPlugin::get()
80{
81 if (!printerSupport) {
82 const QMultiMap<int, QString> keyMap = loader()->keyMap();
83 QMultiMap<int, QString>::const_iterator it = keyMap.cbegin();
84 if (!qEnvironmentVariableIsEmpty("QT_PRINTER_MODULE")) {
85 QString module = QString::fromLocal8Bit(qgetenv("QT_PRINTER_MODULE"));
86 QMultiMap<int, QString>::const_iterator it2 = std::find_if(keyMap.cbegin(), keyMap.cend(), [module](const QString &value){ return value == module; });
87 if (it2 == keyMap.cend())
88 qWarning() << "Unable to load printer plugin" << module;
89 else
90 it = it2;
91 }
92 if (it != keyMap.cend())
93 printerSupport = qLoadPlugin<QPlatformPrinterSupport, QPlatformPrinterSupportPlugin>(loader(), it.value());
94 if (printerSupport)
95 qAddPostRoutine(cleanupPrinterSupport);
96 }
97 return printerSupport;
98}
99
100QT_END_NAMESPACE
101
102#endif
103